product_list = [
    ('华为P30',4000),
    ('华为P40',4500),
    ('苹果11',5500),
    ('苹果12',8000),
    ('Watch_dog',144),
    ('GTA5',199),
    ('Far Cry 5',200),
    ('Airpods2',1000)
]

shopping_car = []
zhifubao = input('请输入你的支付宝余额')
if zhifubao.isdigit():
    zhifubao = int(zhifubao)
    for item in product_list:
        print(product_list.index(item),item)
        choice = input("请输入商品编号")
        if choice.isdigit():
            choice = int(choice)
            if choice >=0 and choice <=7:
                if zhifubao >= product_list[choice][1]:
                    zhifubao = zhifubao - product_list[choice][1]
                    shopping_car.append(product_list[choice])
                    print("你已经将商品%s添加到了购物车，你的支付宝余额是%s"% (product_list[choice][0],zhifubao))
                else:
                    print("你的支付宝余额不足，请选择其他商品")
            else:
                print("你选择的商品不在商品列表里面")
        elif choice == "q":
            print("-----购物车清单-----")
            for item in shopping_car:
                print(item)
            print("你的支付宝余额是%s"% zhifubao)
            break
        else:
            print("请你输入商品编号")
else:
    print("请你输入数字的支付宝余额")